Quarterly report pursuant to Section 13 or 15(d)

7. SHARE-BASED COMPENSATION (Tables)

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7. SHARE-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation Expense by Line Item

The following table summarizes the amount of share-based compensation expense by line item on the statements of operations:

             
Share-based compensation expense     Three Months Ended
      March 31,
(in thousands)     2022     2021
Research and development expense   $                 1,833   $                 1,184
Sales, marketing, general and administrative expense                     1,901                     454
    $                 3,734   $                 1,638
Option Positions

The following table summarizes shares, weighted-average exercise price, weighted-average remaining contractual term and aggregate intrinsic value of options outstanding and options exercisable as of March 31, 2022:

              Weighted-      
          Weighted-   Average      
          Average   Remaining     Aggregate
Options         Exercise   Contractual     Intrinsic
    Shares     Price   Term (years)     Value
Outstanding as of March 31, 2022     1,338,000   $            1.38   6.0   $   4,476,000
                     
Exercisable as of March 31, 2022     1,013,000   $            1.58   5.6   $   3,197,000
Restricted Stock Unit Activity

The following table summarizes activity and positions with respect to RSUs and PSUs for the three months ended March 31, 2022:

            Weighted-average
      Shares     price
Unvested as of December 31, 2021       2,625,000   $                      13.05
Granted           1,742,000                          4.07
Vested         (332,000)                          13.21
Forfeited           (10,000)                          6.60
Unvested as of March 31, 2022       4,025,000   $                      9.17